A cobpobatioh



Feb; 26, 1928;

JQA. PROCTOR ELECTRICAL counausnm Feb. 28, 1928.

1,660,937 J. A. PROCTOR' ELECTRICAL CONDENSERv I Filed March so. 1926 s Sheets-She et 2 I INVENTQR J0: n J. Proctor j .ATTORNEY l mented Feb. 23, lh fil.

JGHN ALB-REE PBGCTOR, 0LT LEXINGTON, MASSAEHUSETTS, ASSIGNOR TO WIRELESS SPECIALTY APPARATUS COMPANY, OF BQSTO1Z, MASSACHUSETTS, A CORIOR-ATIGN ELECTBIGAL connnnsnn.

Application filed March 30, 2526. Serial Ho. 98,435. 7

lhis invention relates to improvements in electrical condensers, useful particularly for high tension service, and more particularly in condensers of the. sheet-stock type,especiallywher'ein the stackl'or high potential serrice comprises a plurality of sections the feces of which are insulated from one another by insulating separotingshcets between the sections in the stack, and the sectionsso separated at their faces being connected in series with one another by conned tions' outside the stack between their re spectire immatures.

Among the various objects of the invention is that of n-ovidingl' a structure which is on improvement on the special type Where in the steck'is enclosed by a casing consisting of insulating material surrouiuling the sides of thehigh potential stuck, such casing also including metal cnd'structures secured to said insulating portion at oppositely disposed openings thereof so that the metal end structures complete the enclosure of the stock and serve as terminals for the stock, the ends of the stack lying substantially odjacent the metal end structures.

The invention consists of the various features of the consiruction substantially as described hereinafter and as shown in the drawings which illustrate :rprelerred form of the invention and. of which Fig. 1 is a plan partly in section;

Fig. 2 is a section at 2-2 of Fig. 1; Fig.3 is :1 section ut3-i5 of Fig. 2;

Fig. 4 is :1 section at l-4 of Fig. 2', loolo ingup (urrowe, Fig. 2) and Fig. 5 s a. side elevation. llbe'generul nature of the completed condenser can be understood best from Fig. 5

wherein casing G (of pyrex glass or of porceloin with on QKtGllOl brown glaze) is in the form of u tube or cylinder entirely surroun lpreferably cemented (Fig. 2) to the outside of casing G; and the outer rims U, U of N and L are provided (Fig. 2) with alined perforations B, B whereby e. plurality of units like Fig. 5, with like ends L, N are adapted to be stacked one upon another, metubbolted together and thereby electri cally connected in series with one anotherto constitute a condenser of very high potential indeed.

The casing Gr preferably is of pyrex glass whereby it is very strong mechanically and said material furnishes an excellent dielectric, withstanding considerable heating and all mechanical and electrical stressesincident to its combination in this condenser. The pyrex glass also permits'a. low thermal coefficient of expansion which is important in connection with its cementin to the metal ends L, N. This casing, w en of pyrex glass, possesses great homogeneity constituting it a highly desirable dielectric material for this purpose. Its surface is not glazed.

ltstransparency makes easy the inspectionof flows in itself and in the embedment W (Fig. 3) of readily fusible insulating material, such as Wax or the like, filling the space bctweencasing G and the stock S. The glass casing G is blown in a mold and is thereby accurately produced to desired dimensions, 'lhe metal ends L, N, and particularly end N,

are die-cost, preferably of aluminum, 'and' thereby formed initially with the cementing grooves shown in Fig. 2, just as the cementing grooves in glass cosing G are formed in the mold-blown operation. I

The protective spark-gap electrode GE Fig. 5) is supported in a radially outwardly projecting portion or bass U of one ot' the end members L, N, (as: Ll: as shown in Fig. 5) so as to lie outside of and parallel to glass casing G, the latter thereby being locatedbetween the sides of enclosed stack S (Fig. 2) and the electrode GE (Fig. 5). The end of electrode GE which'is supported in end member L is threaded as shov'vn and thereby is adjusted-in the threadcdperfora tion thrumember L, during the process of immufurturc ind test, so that the portion of the electrode extending toward opposite potential end metal member N is sepztruted therefrom and definitely set-for a voltage breakdown which is somewhat in excess of the working potential of the condenser.

This voltage may be from twenty-fire to fifty per cent above the working potential. Thereby sparking between electrode GE and terminal N will take lace if the condenser terminals L, N should e subjected to greater otential, so that stack S itself is prevented rom being subjected to potentials as great as such sparking potential and which mi ght injure stack S. Upon such setting of the electrode to the desired sparking distance, the remaining unfilled portion of the perforation thru member L (top, Fig. 5) is filled with a material \VM such as readily fusible iVoods metal for the purpose of preventing access to and interference by the user. The over-all length of electrode GE is made such that when this sparking end is at the proper distance from end N, its 'other end leaves a space in the perforation thru end N, permitting the reception in such space of the fusible metal seal WM.

With reference to Figs. L4, and particir larly Figs. 2-3, these show the interior of the casing formed of the vitreous side wall G and the metal ends L and N. In the process of manufacture the parts G, L and N first are combined in the manner shown in Figs. 2 and 3. These separate parts have .been formed with their cenientin surfaces and-grooves shown and each meta end suceesslvely is put in place on its end of glass casing G and cemented thereto by the application of cement G in said facing grooves and surfaces, and in the spaces between the exterior of tube G and members L and N, The glass casing -.G is formed' with the tapering surfaces T as shown. The members L, N are formed with annular projections G, and with internal grooves GR and GR as shown, the grooves G11 facing the taper '1 of glass casing G, and the groove GR facing groove GR in glass casing G. The inner walls of annular projections G, including the two said grooves therein, (GR and GR), are spaced from the facing portions of the outer surface of easing G, and the cement C fills this space includ- 'ing all the grooves in both the metal iarts L and N, and in the glass casing G. by the metal end structures L and N are securely and permanently united with glass casing G forming sealed annular joints, in such manner that casing G is not injured by the stack clamping strains to be described, it having been found by me that such cas- G withstands without injury to itself the tension strains of clamping the stack S, with a mechanical pressure on the stack ends of the order of 1,000 pounds or more per square inch of electrostatically active area of the stack sheets.

After parts L, N and G have'combined as above, the stack S is inserted within casing G thru the opening in upper end structure L, the lower end of the stack resting on the closed bottom metal member N. Before the stack is inserted within the easing, however, a thin copper strip CS has had soldered to it the bunch of foils projecting from the side of the bottom end section of stack S, so that when the stack S (Fig. 2) with such strip CS attached is inserted in the casing, the lower surface of strip CS is put in contact with the surface of lower metallic end X; and parts of strip CS which project beyond the stack are clamped to metallic end 'Nby means of beaded screws LS (Figs. L3) which are threaded in end N, so that strip CS soldered to the foils atone point, and clamped to N preferably by the four srrews LS shown, all'ords a good electrical and thermal connection from the bottom end section of the stack to metallic end N as a circuit terminal (.XpUSml to air outside the casing. Also strip (IS extends between the end of stack 5 and metallic end N so that when thereafter the slack is clamped against bottom end N, the strip Cb'is clamped thereby to end N at the bottom surface of strip US intermediate the screws LS.

After slack S has been inserted in the cusing as above, there is placed on top of it a stack lead ot special construction, and comprising a thin copper sheet, the central portion L" of which extends substantially over the top of the stack, and end portions L, L" oi which extend upwardly from opposite sides of such intermediate portions, the said ends 1,", L being narrower (Fig. 3? than the part if of the copper sheet whic 1 lies on top of stack 5. sheet lead is placed a metal bearing plate lll. Next an adjustable pressure-applying plate l, of steel is inserted in the casing. This plate l is oblong (Figs. 243); A collar L ol the top end structure is formed with two shoulders LL at diametrically opposite sides of the opening thru it (Figs.- l and $5).' inward.--

Shoulders LL project radially After oblong pressure plate l. is inserted thru the opening between opposite shoulders LL, it is turned 00 to bring ils ends under said shoulders. Before the insertion of plate I, the opposite ends L, L of the top stack lead are brought upwardly around the ends of shoulders LL. PS is screwed thru a central hole in plate I, with its lower pointed end engaging against bearing plate ill. Continued screwing up of PS puts stack S under end-to-end com pression via the upward pressing. of plate 1 against lead-ends L L, and shoulders LL of collar L, whereby the glass casing Gr becomes the tension member of the system clamping stack S, and also the ends L, L of the top .stack lead are clamped between the upper surface of plate P and the lower surfaces of shoulders LL of end L. The upper ends SL of the stack lead are bent over on lhen pressure screw- Then on top of said memes? square inch cl active area of the stack sheets,

then the top of pressure screw PS is out oii'. The height of the casing is adaptcdto the desired length of stack, so as to provide the clamping tolerance space X between th '1 top of bearing plate BP and pressure plate P, to permit proper operation ofthe clamping means duringmanufacturc.

Before the stack-passage inv end L is closed the space inside the casing around the sides of stack S is filled with the molten insulating material W (as parafiine wax) the oblong shape of plate P permitting filler W to extend up above late P, embedding the clampmg means on staclcend connections as well as staclc S, c

- The above described conditions of the stack loads at top-and bottom are very ed; vontageous inproviding improved and ode quate conductivity for electrical currents, and, to some usetui degree, for heat. After stack S is clamped it presses lower stack lead GS against bottom end N; and at the other end, bearing plate 13? is pressed into good contact; wi.th the upper copper sheet stack lead at; L se that three conducting paths are provided from the upper end sec tion of the stock two; thru the copper sheet learlparts L, Li; and the thirdthru metal parts Bit, PS, P and ieadcnds SL, to metal collar L constituting one circuit terminal of the stack. l'Vhen} one of the unit condensers hereof is mounted. end-on with duplicate units, such units are connected in series by clamping colts extendingthruholes B 13 in the bosses ll formed integral with ends L and N. j

Illlcctrical testing of the condmiscr end the adjustment or gap-:electrodeGE proton ably are effected; )llOI to the introduction oi the insulating lillingW.

A 't'tcr filling W has cooied and solidi tied, the

stack-passage thru end L is closed and sealed,

said opening being the one thru which the interior parts have been passed in the above described assembly. The closing of said opening is cl'l'ccted by metal cover GP which may be ol? sheet metal because it is not subject to anyof' the stack clamping strains. The sealing is effected by the introduction of cooling inat'erialfSM in the annular space between the rim of cover GPand the'adjar'cnt annular surface of end collar L This scaling material may be anything desired and may be a mixture oii ortland cement and Medusa cement or sulfur or it may be a mixture of sulfur and plaster. of Paris. lrrci'erably the cement is strongcnoughto seal cover Cl?perinanentlyin place; and in' .hlltll acnse members L and GP are provided 'Wltll pro ections which interlock with the cement; that is, coverv OP is prdi id iil with an annular outward projection GP, and can collar L is provided with inward annular projection (1 R;v above a groove 0Q, so that the joint between L andCP is a looking as well as a scaling joint. I

l particularly point outftind distinctly claim the part, improvement or combination which I claim as my invention or discovery, as follows 1. An enclosed high tension condenser construction comprising a series sectional stack having opposite potential ends; metal end structures one of which has an opening permitting passage of the stack; leads fused to armaturcs of the cndsections o'f'the stack and conductivcly' connecting such opposite potential stack ends respectively with said metal end structures; means clampingsaid leads to said metal end structures; a metal cover secured bysealing material to the metal end structure which has the opening, and closing and scaling said opening; an electrode for a protective spark-gap, supported in one of said metal end mel'nbers.

and extending-toward the other into protective sparking Illfiiilllfiti thereof; and a. casing of insulating material located between said gap electrode and the sides of the stack;

surrounding the stack sides and secured to and supporting said metal cud structures of opposite potential and insulating them from one another, and insulating the sides or the stack from the sparkrgap' electrode. c

2. An enclosed condenser construction comprising a condenser stack and a casing thcrci'or consisting of two metal end structures and an intermediate giass casing-pm:- tion secured by scali 11g material to said metal end structures; one oi said metal end structures being formed with a stock-passage; leads fused to opposite potential-armaturos oi the stack and clamped respectively to said metal end' structures; anda metal cover secured by sealing matcrial'to. said metal end structure having the'staek-passagc, and closing said passage. r

3. An enclosed high tension condenser construction comprising a series. sectional stack metal end structures, one of which is formed. with a, stack passage; an insulating casing extending around the sides of the stack and secured to said metal end struc tures; screw-clamping); means inside said insulating casing between one endot the stack and the metal end structure formed with i the stack passage; leads connecting said metal end structures to opposite potential sections of the stack; a metal cover over said clamping means, closing the stack passage in said and structure and secured .by sealing material to said end structure around said passage; said metal end structures extending radially outward from the insulating casing; and a protecting spark-gap protective sparl electrode having one end electrically connected to and supported in onc of said metal end structures and extending along the outside of theinsulating cas ng and within 'ng distance of the other metal endstructure.

- 4. An encl sed high tension condenser construction c nnprisin a mold-blown glass casing having oppositel' disposed openings, and formed with cement-in grovcs; a series sectional high tension stac ir having its ends located in the vicinity of said casing openings; metal end structures formed with cenienting grooves facing the cement ng grooves in said glass casing; and cementing material titling said cementing grooves and securing the end structures to the ends of said glass casing at the respective openings thereof and in the vicinity of said stack ends, and closing the opposite openings; and

tlli'ttttlt.tl adjustable metallic means between a stack end and one of said metal end structures and putting the stack under eoinpression and the glass casing under tension via, said metal end structure.

5. An enclosed high tensiiin condenser construction comprising a casing of insulating material having oppositely disposed openings, at series-sectional stack having its ends located in the vicinity of said openings; a circuit tern'iiual structure secured to an end of said insulating casing in the vicinity of one of the openings thereot'; an electrically conducting lead from a stack section and extending across an end of the stack; a metal clamping member bearing on the'portion of said conducting lead which. extends across the stack end; a second conducting clamping member bearing against said circuit terminal structure; said lead extending between said second clamping member and said terminal structure; and a coui 'n'cssing member one end of which engages said iii-st clamping member and the other end of which is threaded in the second clamping member, clamped whereby the ctmducting lead is against the two clamping member and the circuit terminal structure.

(3. An enclosed high tension ctmdenser construction comprising a casing of insulating material having oppositely disposed openings, a series-sectional stack havin L its ends located in the, vicinity of said openings; a circuit terminal structure secured toone end of said insulating casing in the vicinity oi.

, one of the openings thereof; a conducting lead from a stack section located near one casing opening;

a metal member clamping one 1portion of said lead between the adjacent stac end and the metal ineinher itself; and a metal member clamping another portion of said lead to said circuit terminal structure.

7. An enclosed condenser coiistructio'n comprising a casing consisting of insulating sides and of metal end structures secured openings, :1 seriessectiona theretot a stack enclosed by said casing; metal stack-clamping means inside the easing between a stack end and of one of said metal end structures; and a stack-lead em.

tending between said clamping means and said metal end structure and thereby clamped between-them in conductive relation with the metal end structure.

8. An enclosed high tension condenser construction comprising a casing of insulat-.

ing material having op )ositely disposed l stack having its ends located in the vicinity of said openings; metal terminal structures secured to the ends of the insulating casing in the vicinity of said openings; metal clamping means ex tending from one stack-end to one of said metal terminal structures and putting thethe casing to compress the statfrom end to end, one of said metal end structures being i'oi-iiied with an opening permitting passage ofthe stack, and a metal cover for such opening in such and structure; sealing se-,

curing material around the joint between the metal end structure and saidmetal end; and projections interlocking with said material and extendingtherein respectively from: said metal end structure and metal cover.

It). AH'OHCIOSCtl liightension condenser construction comp'ising a casingiof insulating iiiateria-l having oppositely disposed openings, at seiiessectional stack having its ends located in the vicinity of said openings;

metal end structures secured to the outside of theends of the insulating casing and projecting radially outward from the insulating easing; said metal end structures being condneti'vely connected to opposite potential stack sections; and a proteetifl! spark-gap electrode; outside the insulating casing, threaded and supported in an outwardly projecting portion of one of said end structures, extending toward the other metal end structure parallel to and outside of the insulating wall of the casing, and adapted to have its end spaced from said other metal end structure for break-down somewhat in excess of the operating potential of the con- QCIISGI; the first end structure being formed with a threaded perforation receiving said electrode; the gap-electrode havingsuch length that when adjusted as specified it leaves a portion of said perforation open; and sealing material located in said perforation opening.

'11. Anenclosed high tension condenser construction comprising a series-sectional stack having opposite potential ends; metal end structures; leads conductively connecting the oppositepotential ends of the stack rcspecti'vel with saidmetal end structures-g.

an electro e of a protective spark-gap'supported in one of said metal endstr'uctures and'extending toward the other into protective sparking distance thereof; and an insu letting-casing extending around the sides'of the stack, secured to and supporting said opposite potential metal end structuresand insulating thematrom one another and lo-,

cated between said protective gap electrode and the sides of the stack. I I v i 12. An enclosed high tension condenser construction comprising an insulating casing having oppositely disposed opemngs; a

series-sectional stack having its ends located 1n the vicinity-of said openings; metal end structures" secured respectively to the ends of said insulatingcasing at the openings thereof; stack leads respectively fus'edto the iii-matures of difi'erent stack sections; screws respectively clamping said respective leads to. said metal end structures and metal stack-clamping means located between a stack end and one of said metal end structures; one of said stack leads extending between a stack'end and the adjacent metal end structure and thereby clamped to-the latter; and the other of said stack leads extending between said clamping means and the adjacent metal end structure and thereby clamped. to the latter.

,tional stack; an insulating casing extending around the sides of=said stack;.a metalv end structure secured to an end ofrsaid insulating casing at one of the openings, thereof a flexible stack lead fused to the armatures of a stack section and extending over a stack end and to said metal end structure;

" stack lead to the metal stack-clamping means the end of the stack, thereby puttin and adjustable metal stack-clamping means extending between the metal end structure and'the adjacent part of the stack lead on the one hand, and on the other hand, the

portion of the stack'lead extending across the insulating casing under tension an the stack under compression and clamping the and to the metal end structure. 7

14. An enclosed high tension condenser construction comprising an insulating casing having oppositely disposed openings; a

I I structure; 13. An enclosed high tens on condenser constructlon which comprises a series seeseries-sectional stack having its endsxlocated in the-vicinity of saidopenings; a metal end structure secured to one end of said insulating casing; metal stack-clamping means locatedbetween a stack-end and said metal" end structure; and'a circuit lead fused to.

the armatures ofa stack section and havin a portion clamped betwcenthe stack endand sa d clamping means md having another portion clamped between said metal end structure and said clamping means.

15. An enclosed high tension condenser construction comprising arr-insulating casing having oppositely disposed openings, a serice-sectional stack having its ends located in the vicinity of said openings; circuit terminal structures secured to the ends of said insulating casing at the openings thereof; conducting leads fused to armatures of different stack sections and extending respectively to said circuit terminal structures' and screws respectively clampixigsaid lea ends to said circuit terminal' structures.

16. An enclosed high tension condenser construction comprising a. seriedsectiohal stack, an insulating casmgsurzpunding the sides of the stack; a metal circuit terminal structure secured to an end-oiysaidinsulating casing'in the vicinity of one'of the openings thereof; and an electrically conducting lead ,from a section of the stack, twoendsof such lead eit'ending. to'said circuit ter--''' minal structure, and an intermediate part of said lead extending across an-end of the stack; and metal 'means clamping said intermediate portion of said lead against thel stack end and also clampingthe two ends of the lead againstqsaid circuit terminal" 17; An enclosed high tltension condenser construction comprisingv a series-sectional stackhaving opposite potential ends; two

metal end structures velectrically connected with said ends; one at least of WhiChg'lS formed with a stack-passage opening; aces-7 ing of insulating material having oppositeend' openings and secured at its ends to said metal end structures a metal cover located.

Jenn ALBERT rnoo'ron. 

